继发性甲状腺功能减退时，甲状腺激素的含量变化是 （）
A.T3，T4升高，TSH下降
B.T3，T4下降，TSH上升
C.T3，T4下降，TSH下降
D.T3，T4升高，TSH升高
E.T3，T4升高，TSH不变
参考答案：C
解析：继发性甲减时，主要病变在垂体或下丘脑，因TSH分泌不足，可见T3，T4含量也下降。因此本题最佳选项是C。
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| Jogging(慢跑) became popular about twenty years ago and has been a favorite way of keeping fit for lots of people. People of any age like to do it. Teenagers can jog and people in their seventies and eighties can jog, too. They can jog anywhere. People jog around college campuses, around housing estates, and in parks. Jogging doesn't need any special training skills. Do some warm-up exercise and then you are ready to start. Jogging is good for health. It is good for the lungs (肺) and the heart. It is easy and convenient. | ||||||||||
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